I recently got cod4 on pc, i played it online and it worked. My friend then told me to install patch 1.6 an 1.7 it said i had already installed 1.6 but not 1.7. So i installed 1.7. But then when i join a server it comes up with something like: Server is a different version: 1.6. So i then istalled 1.4 and 1.5 it said i had already installed them so what happened because it was running perfectly before i installed 1.7 and tried for 1.6

Help plz

Looks like you'll have to uninstall the game then install it again. However if its a large patch I'm sure if you wait all the servers will update too.